Containers



June 1964 N. F. WENDER ETAL 3,

CONTAINERS 3 Sheets-Sheet 1 Filed April 2'7, 1961 mm 3 2% M,M {7761MATTORNEYS June 2, 19 N. F. WENDER ETAL CONTAINERS 3 Sheets-Sheet 2 FiledApril 27, 1961 J. aw

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ATTORNEY r CONTAINERS Neil Wander and 301m M..Lynch, Knoxville, Tenn,assignors to Dcrnpster Brothers, Ina, Knoxville, Tenn a corporation ofTennessee Filed Apr. 27, 1961, Ser. No. 106,931"

11 Claims, ((31. 214-462) I This invention relates to improvements incontainers of the character adapted for "use in collecting andtransporting materials. I

- United States PatentO One satisfactory way of handling loose materialis to provide containers of-suitable size into which the material can bedeposited. In the collection of refuse, for example, several containersmay be placed at convenient'lo cations and emptied from time to time asthey are filled.

Such containers may be provided with a drop bottom door which opens fordumping the contents from the container. Normally the container isfilled while sitting on the ground or other supporting surface, and thematerial is placed in the container through doors provided for thispurpose.

in the upper portion of the container.-

After the container is full it may be lifted onto a'.vehicle by means ofa hoisting apparatus on the vehicle, and then transported to a pointwhere the contents of the con tainer are damped. The empty container isthen reeassess le Patented June areas ing to establish a detachableconnection between the container and the lifting arms.

In this type of front end loading equipment the fork arms extendalongthe outside of the container and fit into pockets at the ends ofthe container provided for receiving-the fork arms. Actuation of thelifting arms and the fork arms-by suitable power means is effected inorder "to lift the container over the cab of the vehicle to a positionabove the body of the vehicle so that the contents of the container maybe'dumped through a hopper into thebody. The empty container maythereafter be swung I back to a position on the ground in front of thevehicle.

When containers are emptied by such front end loading equipment, it isnot necessary to transport the containers themselves to a distantlocation for dumping. A vehicle equipped with this type of front endloading equipment and with a suitable body is driven from point to pointwhere various containers are located. One after another the fullcontainers may be emptied into the body of the vehicle, and once thebody is full, then the vehicle can make a trip to the dumping area andthe contents emptied from the-body. In this manner, it is not necessaryto returned to the same location'or to a new location for I refilling.

The drop bottom door provided on such containers is hinged to the bodyof the container so. that it may swing downwardly therefrom. When thecontainer is resting V uponthe ground, the drop bottom door is closedand fits snugly with the bottom portion of the container to pro vide aclosure therefor.

Hoisting apparatus for handling this type of drop bot tom container isdisclosed in prior Patents; for example,

V ,Patent No. 2,281,183, issued April 28,1942, and Patent 5N0.2,369,722, issued February 20, 1945,. In the operation of this type ofhoisting apparatus for lifting a drop bottom container onto a vehicle,the container is picked up in a manner whereby the drop bottom door isheld closed during the transporting of the container tothedumpinglocation. When it is desired to dump the contentsffrorn thecontainer, the body of the container is held in an elevated position andthe drop bottom. door is allowed to swing downwardly thereby opening thebottom portion of the body so thatthe' material is free to flow from thecontainer.

Such hoisting'apparatus used for handling dropbottom; containersinherently provides that the drop bottom doorwill be held firmly closedwhen the container is lifted onto orlowe'red from thetran'sportinglvehicle. When such containers are resting upon. the groundor other support- I ingsurface, the body portion of the container fitssnugly over the dropbottom door and the weight of the body portionprevents an inadvertent. opening of the bottom portion of the container.

. Other types of'equipment used in handling containers Y b which holdloose materiahfsuch' astrash for example, are r referred to generally asfront endlo'aders or front end loading equipment, These typcsof hoistingequipment usually employ a pair of lifting arms which are pivotally Iconnected to thetransporting vehicle and extend to the front of, thevehicle wherea connection is established be-- tween the lifting arms andthe container. Qnesuch type -of'front end loading equipmentis shown, forexample,-

" j in Patent No. 2,900,096, issued August 18, 1959, where v in thefront end loading equipment" includes," in'addition to the pair oflifting arms, a'front' torques tube extending acrossthe vehicleand'connectingthe lifting arms, and a patrol? fork arms mounted on thetorqueitube servf move the containers from the filling location, and thenumber of trips which the vehicle must make to the dumping location canbe minimized.

. The containers used in connection with front end loading equipmentgenerally include a bottom which is integral 7 with or permanentlyconnected to the body portion of the container. Suitable types ofopenings are provided at or near the top portion of the body of thecontainer through which-material may be placed in the container.

In the use of containers of the type which are employed with front endloading equipment it is not necessary that the bottom of the containersbe provided with a drop bottom door. In fact, it is absolutely essentialthat during the dumping operation of these containers, thebottomfportion of the containers remain fixed or closed.

When the lifting arms of the front end loading equipment swing acontainer upwardly, the material within the container rests on thebottom of the container. Therefore, it v It is important to note 'inthis'connection that the two types of containers previously described,and the two types of hoisting apparatus, have become very successful ,inthe past; Consequently,there are in existence a large number ofbothtypes of containers and a large number of both types of equipment usedfor hoisting these con- I tainrs. Consequently, it is necessary, whencon'sidering the problem ofproviding a container which can be ac:commodated byboth types of hoisting apparatus, that the hoistingapparatus itself not be modified because it is "necessary. that suchhoisting apparatus still be available for usefi'n connection with thetwo diiferent types of containers b, Accordingly, it is the primaryobject of this invention to providea device'for use inconnectionwithdrop bot tomtcontain'ers whereby such containers may be used vwithfront end loading equipment as'well as other, types of 2 hoistingapparatus.

This may be accomplished by providinga'sle'eve .as-i I v sembly on eachopposed end wallfo f'the drop bottom container. Each assembly includes asliding sleeve memher which can be adjusted to a rearward position sothat hoisting apparatus may be employed in connection with the dropbottom door, or to a forward position so that front end loadingequipment may be employed to handle the container. A plate member isconnected to and movable with the sliding sleeve member, and has a notchat its forward end for receiving therein a pin on the drop bottom door.When the sleeve member is moved to its forward position the pin andplate cooperate to hold closed the drop bottom door.

This embodiment of the invention is illustrated in the accompanyingdrawings, in which:

FIG. 1 is a side elevation view of a vehicle equipped with'hoistingapparatus for use with containers which have a drop bottom door, andshows in full lines and broken lines a container embodyingcertainaspects of this invention;

. FIG. 2 is a side elevation View of a vehicle equipped with front endloading equipment, and shows in connection therewith the containerillustrated in FIG. 1;

FIG. 3 is an enlarged side elevation view of a sliding sleeve assembly;

FIG. 4 is an endelevation view corresponding with FIG. 3, wherein aportion of the container isshown in cross section; and

. FIG. 5 is a sectional view taken along line 55 of FIG. 3.

In FIGS. 1 and'2 there is illustrated a container 16 of the type havinga drop bottom door 12 hinged, or other wise pivotally connected at 14 tothe body of the container. This type of drop bottom container is adaptedfor use with any form of hoisting apparatus suitable for accommodatingsuch drop bottom containers. This hoisting apparatus might includeeither a truck mounted hoisting unit, as shown in Patent No. 2,281,183,issued April 28, 1942; a self-propellcd vehicle, as shown in Patent No.2,751,100, issued Iune19, 1956; a hoisting unit of the character showninPatent No. Re. 23,546, issued September 9, 1952; or a fork lift typeof hoisting unit. In FIG. 1, the container 10 is illustrated inconnection with oneform of hoisting unit, but it will be understood thatthe container 10 may be used with any other form of hoisting apparatuscapable of handling drop bottom type containers.

The form of hoisting apparatus 19 shown in FIG. 1 is mounted on aself-propelled vehicle, 15 having a chassis indicated generally bythenumeral 16. A subframe assembly 18 is mounted on the chassis 16 andincludes a bucket rest 20 for supporting the container 10, which asillustrated in FIG. 1, is located at the rear'end of the chassis 16. Thecontainer 10 is adapted to be pulled upon and held against a carriageassembly 22 which is capable of movemment forwardly and backwardlyrelative to the chassis 16, as described in detail in Patent No.2,281,183. A pair of booms 23 are.located above the chassis. 16 and haveswinging movement in a vertical direction.

The drop bottom door 12 of the container 10 is hinged at 14 to' a frontwall 24 at the bottom of the body portion of the container. Thecontainer 10 is providedwith a rear wall 25 and opposed end walls 26having notches 28 thereinat the bottom for receiving upwardly extendingtriangular-shaped end plate 30 of These endplates 30 are the drop bottomdoor 12. shaped to fit within the notches 28 when the drop bottom door12 is closed.

The end plates 36 have fixed thereto lifting pins or lugs 32 whichprotrude outwardly from' the end plates 30 for connection by a chain 34or other type of flexible member of the hoisting apparatus. 19. Thechains 34 are connected'to the upwardly extending ends of' the booms 23.When the free ends of the chains 34 are connected with the lifting pins32', and when the booms 23 are swung upwardly, the container 10ishoisted from ary 3, 1956. When the body portion of the container 10 isheld suspended on the carriage assembly 22, the

booms 23 may be lowered, thereby allowing the drop bottom door 12 toswing downwardly, as illustrated in broken lines in FIG. 1.

The servicing of a full container 10 by a vehicle 15 equipped with thehoisting apparatus 19 is carried out as follows. The vehicle 15 isbacked up to the container 10 as the container rests upon the ground orother supporting surface. The chains 34 are connected with the liftingpins 32 on the end plates30, and the hoisting apparatus 19 is actuatedto lift the container 10 onto the vehicle chassis 16. The container 10is then transported to a dumping location where the hoisting apparatus19 is actuated to open the drop bottom door 12 in order to allow thecontents of the container 10 to fall out.

The hoisting apparatus 19 is then actuated to close the drop bottom door12, and the empty container 10 may be returned to the same location ortransported to a new location for refilling. Then the container 10 islowered onto the ground and the chains 34 disconnected so that thevehicle 15 may be employed to service other containers in a similarmanner.

In FIG. 2 there is illustrated one type of front end loading equipmentwhich maybe employed to empty the contents of the container 10. It iscustomary to use a vehicle of the character generally indicated by thereference numeral 40 which is self-propelled under the control of anoperator located within a cab 42.

A body 44 is provided on the vehicle chassis behind the cab 42 and maybe of any suitable type for receiving the particular material to behandled, and may be provided with packer mechanism for compressing thematerial, if this is desired." The top portion of the front of the body44 is provided with a filling opening or hopper 46 through whichmaterial may be dumped into the body 44. The character of the bodyotherwise may be varied as desired.

The front end loading equipment or hoisting apparatus used in connectionwith the vehicle 40 is indicated in FIG. 2 by numeral-50 and includes apair of lifting arms 52 spaced apart a distance correspondingsubstantially with the width of the cab 42. The lifting arms 52 may beof gooseneck shape or inverted U-shape, for example, so as. to extendover the top and downwardly in front and back of the cab 42, asillustrated in FIG. 2. 7 At the back of the cab 42 the lower ends of thelifting arms 52 are fixed ona rear, horizontally extending torque tubeor rod 54 which extends substantially from one side of the vehicle 40 tothe other. The torque tube 54 is journaled in bearingtboxes which arefixably mounted on the vehicle chassis. In this manner the lifting arms52 are pivotally mounted to the vehicle 40. Lever arms 56 are fixed onthe torque tube 54 and extend downwardly therefrom. The free ends of thelever arms 56 are pivotally connected at 58 to suitable power devices60, such as a conventional hydraulically actuated cylinder and pistondevices, which in turn are mounted on the vehicle chassis.

"At the front of the vehicle 40 the lifting arms 52 are connected byahorizontally extending front torque tube or rodv 62 which is journaledin bearing boxes secured 1 tional hydraulically actuated'cylinder andpiston device, is mounted on each of the lifting arms 52 by means of abracket 68 so that the power device 66 extends along the correspondingarm 52. The free end of a piston rod 70 t of the power device 66 isconnected to the free end of the corresponding lever arm 64. A pair offork arms 72 are rigidly mounted'near opposite ends of the torquetube 62and have attached to their free ends a tow plate 74.

On" opposite end walls 26 of the container 10 there is securely attacheda sleeve assembly 100. Each of the sleeve assemblies 100 receivestherein one ofthe fork arms 72 'of the lifting mechanism 50. The sleeveassemblies 100 will be described in detail below.

7 The hoisting apparatus 50 is operated as follows in order to dump thecontentsof the container 10 into the body 44. -The power device 66 maybe actuated under ,the force of hydraulic pressure in order to rotatethe lever I arms 64 which in turn rotates the torque tube 62 so as toproperly align the fork arms 72 for entrance into the sleeve assemblies80. The lifting arms 52 may be pivoted about the axis of the rear torquetube 54 by operation tainer 10"while it is on the ground or othersupporting surface in front of the vehicle 40, the vehicle is maneuveredinto the proper positionand then the power devices 60 and 66 areoperated so that the fork arms 72 are at the. proper angle with respectto the sleeve assemblies 80 so as to effect a suitable connectionbetween the fork arm 72 and the sleeve assemblies 80. V

The power devices 60 are operated further to swing the lifting arms 52upwardly whereby the container 10 is been moved toits extreme positiontowards the front or V ofv the power devices 60. In order to establish aconnection between the lifting mechanism 50 and the conhoisted over the.cab 42 andinto dumping position at a the top and front of the body. 44.Simultaneously, the

"fork arms 72 may be actuated by the power devices 66 to rotate slightlyin a counterclockwise direction, with reference 'to FIG. 2, so that thecontainer 10 may be kept tilted slightly toward the vehicle butsubstantially upright during the swinging movement above the body 44.Once the container 10 is above the. hopper 46 the fork arms 7 2 may beactuated to rotate in a clockwise direction far enough so that thecontainer 10 isinverted to dump the contents thereof through the hopper46 and to the body 44.

After the contents of the container 10 are dumped in this manner,the'power devices 66 maybe actuated to rotate the fork. arms 72 so thatthe container 10 will in'front of the vehicle 40.

g As pointed out previously, the containers employed with thehoistingapparatus 19, illustrated ,in FIG. 1, are pro-' vided with drop'bottom doors. When the. body portions of such containers are suspendedabove the ground, these drop bottom doors are free to swing downwardly.When -,be returned to a generally upright position The'lifting' 'arms 52then may be lowered by proper actuation of the powerdevices 60 to lowerthe container 10 to the ground it is desirous: to use these containerswith thehoisting;

T apparatus illustrated in FIG. 2, for example, it is necessar'y thatthe drop'bottom doors of the containers be held 5 closed, but it is also,jrlecessary that the drop bottom doors be ready for use again with thehoisting apparatus illusftratedinFIGnl. 'f- :y In FIGS. 3-5 there isillustrated the sleeve assembly which has'been referred; to previously!One such sleeve assemblyis provided on -each 'opposite endwall 26 0f thecontainer-'10, and as described previously, is

. i adapted to receive therein a fork arm 72 of thehoistingapparatusitls,

.Each sleeve assembly 100 includes a hollow sleeve 1riern-.

her 102 which may be formed of a channel member and:

a plate member, for example, as illustratedin' FIGS.

andS. The sleeve member 102 provides an opening 7 extendinglongitudinally .therethrough for uncrbstructedi entrance offayfork arm72; A suitable number of U- shaped braces 104arefixed to the end" wall26 of the container 10, as'by welding, and each brace may be strength-'ened by gussets 106 asnecessary. The sleeve member 102 fits looselybetween the U-shaped braces 106 and the end the center of the container10. l I

In order to hold the sleeve member 102 in either one of its extremepositions, a position adjuster 110 is provided The position adjuster 110is mounted on the end wall 26 of the container 10 bymeans of an anglemernher 112 and includes a short sleeve 113 through which extends aplunger 114. 'An enlarged head portion 115 of the plunger 114 extendsdownwardly and outwardly of thesleeve 1'13. Within the sleeve 113 aspring 116 bears 'on the enlarged head portion 115 and tends to forcethe head portion 115 to its outwardly extended position.

A ring 118 which is larger in diameter than the sleeve 113 is connectedto the upper end of theplunger 114 and extends upwardly abovethe sleeve113 so as to be in a position to begrasped. Also, the ring 118 serves toprevent the plunger 114 from sliding out of the sleeve 113 due to theaction of the spring 116.

The head portion 1150f the plunger 114 is adapted to fitinto either oneof two holes 122 or 124 located in the top portion of the sliding sleevemember 102. The holes 122 and 124 are spaced apart a suitable distancelongitudinally with respect to the sleeve member 102 so that whenthesleeve member 102 is in the positionillustratcd in FIG. 1 the hole124will be aligned with the head portion-115 of the position adjuster110, and when the sleeve 1 member 102 is in the position illustratedinFIG. 2, the

hole 122 will be aligned with the head portion 115.

The top edge of the short sleeve 113 is provided with a shallow notch126.. The ring 118 may be grasped and pulled upwardly thereby pullingthe plunger 114 and the' head portion 115'upwardly and out of either oneof the holes 122 and 124., Then the ring 113 may be twistedapproximately 45 degrees in either rotational direction and released sothat the spring 116 will pull the ring 118;-

downwardly and into the notch 126. When this is done, the headportion115 is above the sleeve member 102 and the sleeve may be adjusted easilyto either one of its extreme positions without interference from thehead portion 115. After the ring 118 is turned to the position.illustrated in FIG. 3, thelower part of the ring fits int'o deep notchesin the top edge of the sleeve 113 so that the head portion 115 may fitinto either one of the holes 122 or 124. r r r v When itis desired tofuse the container 10 with the hoisting apparatus 19 illustrated in FIG.1, the sleeve member 102 ofthe sleeve "assembly 100 canbe moved to'itsrearward 'position'as illustrated in FIG. 1 and held in thisposition bythe adjuster 110. The sleeve. member 102 isthenout of the wayof thechain's 34 0f the hoisting apparatus 19. The chains 34 thenfcan be conneeted easily to the lifting pins 32andthey are free to move withrespect to the container 10 i as "m stered in FIG. 2 and held there bythe adjuster 1111f When the sleeve 1112 .isin its forward position it isadjacent the center of the container 10. This creates a balancedcondition when the fork arms 72 of the lifting apparatus 50 areinsertedin thesleeve members 102 and employed to hoist the container 1i}above the vehicle 40. The fork arms 72 thereby apply theirlifting forceIn FIG. 2, the a without interference'from the sleeve member 102 '1 G nthe other hand,'when it is desired to use'the container 10 in.connection with the hoisting apparatus 50 illustrated inFIG. 2, thesleeve member 102 of the I sleeveassembly. 100 canbe moved to itsforwardposition 1 at a point suitably close to the center of thecontainer 10.

Extending longitudinally of the'sleeve assembly 1% and parallel with thesleeve member 102 there is a rectangular shaped bar 130, the ends ofwhich are rigidly fixed with the C-shaped end retaining members 108 onthe sleeve member 162. Rigidly fixed to the bar 130 and dependingdownwardly therefrom beneath the sleeve meme her 102 there is a plate132. The forward end of the plate is provided with a notch 134 which isslightly larger than the diameter of the pin 32 on the drop bottom door12.

In FIG. 3 the sleeve member 102 is shown in its forward position. Inthis position, the plate 132 is moved to its forward position along withthe sleeve member 192, and the notch 134 in the plate 132 receives thepin member 32. With the adjuster 110 having its head portion 115extending into hole 122, the sleeve member 102 and in turn the plate 132is locked in the position illustrated in FIG. 3, while a protrudingportion 136 of the plate 132 extends beneath the pin 32.

With the sleeve assembly 101) adjusted to the position just described,the container is ready for use in connection with the lifting apparatus50 illustrated in FIG. 2. I

The fork arms 7'2 may be inserted through the sleeve membersltiZ toestablish a connection between the lifting assembly 50 and the container10. As the lifting arms 52 are actuated to swing upwardly, the fork arms72 in turn move upwardly in contact with the upper portion of thesleeves-102, and because the sleeve assembly 19.0 is secured firmly tothe side 26 of the container 19, the container in turn will be swungupwardly. As the container 10 is moved upwardly in this manner, portion13,6 of the plate 132 pulls upwardly on the lifting pin 32.Consequently, the drop bottom door 112 will be moved will not be free toswing downwardly.

The sleeve assembly 100 may be used with containers of various sizes sothat they may be employed with front end loading equipment as well aswith hoisting apparatus used in connection with drop bottom doors.Existing drop bottom containers may be converted to use with front endloaders, yet'they may still be employed as drop bottom containers. Thenotched plate 132 automatically latches closed. the drop bottom door,and automatically unlatches the door as the sliding sleeve 102 isadjusted to the desired position. I

While the invention has been illustrated and described in a certainpreferred embodiment, it is recognized that other variations and changesmay be made therein without departing from the invention as set forth inthe claims.

We claim:

1. The combination with a container having a drop bottom door, oflongitudinally extending sleeve means for establishing a connection withhoisting apparatus, said means being movable longitudinally, and meanson the sleeve means and movable therewith for holding the drop bottomdoor closed.

2. The combination with a container having a drop bottom door, of sleevemeans for establishing a connec-v tion with hoisting apparatus, saidsleeve means being movable to various positions with respect to thecontainer, means connected with the sleeve means and movable therewithfor holding the drop bottom door closed; and means for holding thesleeve means in the various positions.

3. The combination of a container, a drop bottom do or hingedto thecontainer, first hoisting means engageable with the door for hoistingthe container, longitudinally door hinged to the body and serving as abottom for the container when closed, pin members on the'door, andlongitudinally extending sleeve members on the end Walls; said sleevemembers being movable longitudinally, hoisting means engageable withthepin members on the door for hoisting the container; second hoistingmeans engageable with the sleeve members for hoisting the container,said hoisting means being useable alternatively; and means on the sleevemembers and movable therewith for holding the door closed when thesecond hoisting means is used.

5. The combination of a container having a body including front and rearwalls andopposed end walls, a door hinged to the body and serving as abottom for the container when closed, pin members on the door, andlongitudinally extending sleeve members on the end walls; said sleevemembers being movable longitudinally, hoisting means on a vehicle andengageable with the pin members on the door for hoisting the containeronto the vehicle; second hoisting means on another vehicle having a bodyand engageable with the sleeve members for hoisting the container abovethe body, said hoisting means being useable alternatively; and means onthe sleeve members and movable therewith for holding the door closedwhen the second hoisting means is used.

6. The combination with a container having a bottom discharge door, saiddoor having a projection thereon extending outwardly from the.container, of sleeve means for establishing a connection with hoistingapparatus, said sleeve means being movable to various positions withrespect to the container, means connected with the sleeve means andmovable therewith for engaging said projec tion for holding the bottomdischarge door closed.

7. The combination with a container having a bottom discharge'door, saiddoor having a projection thereon extending outwardly from the container,of a sleeve for receiving a lifting arm of hoisting apparatus, brackets,said brackets being spaced apart and each having an opening therein,said sleeve extending through said bracket openings, means for securingthe brackets to the container, and means on the sleevefor engagementwith said projection upon longitudinal movement of said sleeve in saidbrackets, whereby the door is held closed during lifting of thecontainer byv the hoisting apparatus.

8. Apparatus for establishing a connection between front end loadingtype hoisting apparatus and a container of the type having end walls anda bottom discharge door with upturned ends substantially coplanar withthe end walls, and having projections on said door ends; comprising' asleeve for receiving a lifting implement of said hoisting apparatus,said sleeve having an elongated bearing surface therein, bracket meansadapted to be secured to-one of said end walls, means mounting saidsleeve in said bracket means for longitudinal movement relative,

thereto, said bracket means overlapping said bearing surface of saidsleeve, andmeans on the, sleeve for selectively engaging said projectionupon longitudinal movement of said sleeve, whereby the bottom dischargedoor is held closed while the container is lifted by said hoistingapparatus.

9. Apparatus for use with a container of thetype having end walls and 'abottom discharge door with upturned ends substantially coplanar with theend walls, and having aprojection'on each door end extending outwardlytherefrom, said apparatus including a sleeve having an elongated bearingsurface therein for engagement by a lifting arm of hoisting; apparatus,brackets for securing the. sleeve to oneof said end walls, said bracketsoverlapping a portion of said sleeve and said bearing surface, saidsleeve bearing surface extending through said brackets and movablelongitudinally insaid brackets, and aplate secured to said sleeve inposition for selectively engaging said projection upon longitudinalmovementof said sleeve whereby the door is held closed while thecontainer is lifted by a hoisting apparatus engaging said sleeve.

10. Apparatus for establishing a connection between :-front end loadingtype hoisting apparatus and a container of the type having'end walls anda bottom discharge door with upturned ends substantially coplanarwiththe end walls, and having a projection on each door end, comprisinga sleeve for receiving a lifting implement of said hoisting apparatus,said sleeve having an elongated bearing surface therein, bracket meansadapted to be secured to one of said end walls, means mounting saidsleeve in said bracket means for longitudinal movement relative thereto,said bracket means overlapping said bearing surface of said sleeve,means 'on the sleeve for selectively engaging said projection uponlongitudinal movement of said sleeve, and means for releasably holdingthe sleeve in a forward or rearward position, whereby the bottom withupturned ends substantially coplanar with the end' walls, and having aprojection on each door end, comprising an elongated tubular sleevehaving a bearing sur- 10 face therein for receiving a lifting implementof said hoisting apparatus, bracket means adapted to be secured to oneof said end walls, means mounting said sleeve in said bracket means forlongitudinal movement relative thereto, said bracket means encirclingsaid bearing surface of said tubular sleeve, and means on the sleeve forselectively engaging said projection upon longitudinal movement of saidsleeve, whereby the bottom discharge door is held closed while thecontainer is lifted by said hoisting apparatus. I

References Cited in the file of this patent UNITED STATES PATENTS2,289,024 Lambert July 7, 1942 2,369,722 Dempster Feb. 20, 19452,702,645 Dempster et a1. Feb. 22, 1955 2,900,096 Dempster et a1 Aug.18, 1959 2,936,916 Dempster et al. May 17, 1960 2,938,641 Dempster eta1. May 31, 1960 FOREIGN PATENTS 364,731 Great Britain Jan. 14, 1932

3. THE COMBINATION OF A CONTAINER, A DROP BOTTOM DOOR HINGED TO THECONTAINER, FIRST HOISTING MEANS ENGAGEABLE WITH THE DOOR FOR HOISTINGTHE CONTAINER, LONGITUDINALLY EXTENDING SLEEVE MEANS ON THE CONTAINER,SECOND HOISTING MEANS ENGAGEABLE WITH THE SLEEVE MEANS FOR HOISTING THE